Crushing mill with hammer-rotor, and adjacent adjustable support carrying traveling-breaker-plate and screen



Apnl 1, 1958 K. KNIGHT 2,828,922

CRUSHING MILL WITH HAMMER-ROTOR, AND ADJACENT ADJUSTABLE SUPPORT CARRYING TRAVELING-BREAKER-PLATE AND SCREEN Filed Feb. 8, 1955 2 Sheets-Sheet 1 2, INVENTOR,

7 44 v LLOYD K. KNIGHT, 7 BY AGENT.

April 1, 1958 L. K. KNIGHT CRUSHING MILL WITH HAMMER-ROTOR, AND ADJACENT ADJUSTABLE SUPPORT CARRYING TRAVELING-BREAKER-PLATE AND SCREEN Filed Feb. 8, 1955 2 Sheets-Sheet 2 INVENTOR; LLOYD K. KNIGHT,

United States Patent;

CRUSHING WITH HAMMER-ROTOR, AND ADJACENT ADJUSTABLE SUPPORT CARRYING TRAVELlNG-BREAKER-PLATE AND SCREEN Lloyd K. Knight, Columbus, Ohio, assignor to The Jeffrey Manufacturing Company, a'corporation of Ohio Application February 8, 1955, Serial No. 486,935 Claims. Cl. 241-89) One object of the invention is to provide improved means for use in a crushing, grinding or pulverizing apparatus of the type set forth above that forms a support for a traveling breaker plate and a screen both of which cooperate with the rotor of the apparatus to reduce material.

Another object of .theinvention is to provide an improved crushing, grinding or pulverizing apparatus of the type set forth above including improved means, or the improved' means per se, which means forms a support including a backing or bed plate about which a traveling chain breaker plate circulates while the latter cooperates with the crushing rotor .of the apparatus and a screen 7 also adapted to cooperate with the rotor and being spaced from the backing or bed plate whereby the traveling breaker plate may pass between said screenand backing or bed plate.

Other objects of the invention will appear hereinafter, the novel features andv combinations being set forth in the appended claims.

In the accompanying drawings:

Fig. 1 is a side view in elevation of a crusher, grinder or pulverizer apparatus including features of the invention and in which a flywheel is omitted;

Fig. 2 is a view in section and elevation showing the internal arrangement of the apparatus seen in Figs. 1 and 3, the section being taken on line 22 of Fig. 3,and looking in the direction of the arrows;

Fig. 3 is a view in section and elevation in which the major portion of the endless chain breaker plate is broken away, the section being taken on line 3-3 of Fig. 1; t

Fig. 4 is a view in perspective, with portions broken away, of the screen'and frame for carrying the endless chain breaker plate of the apparatus seen in Figs. 1, 2 and 3; r

Fig. 5 is an exploded view in perspective of one of the screen side elements and a fragment of one of the screen bars seen in Fig. 4;

Fig. .6 is a view in plan of a portion of the screen seen in Fig. 4;

Fig. 7 is a view in section, the view being taken on 1ine"77 of Fig. 2 looking in the direction of the arrows, the view showing only one-half of the symmetrical apparatus; and

Fig. 8 is a view in perspective, with portions broken away, of a modified form of screen and frame for carrying'an endless chain breaker plate'which may be substituted in the crusher, grinder or pulverizer seen in Patented Apr. 1,1958

Figs. 1, 2 and 3 for the screen and frame thereof which I:

is shown in Fig. 4, the screen of Fig. 8 being a one-piece casting.

The crushing, grinding or pulverizing apparatus shownin the drawings includes a main frame, casing or housing 10 formed of upright end walls and side-walls 11 and 12, respectively, mounted upon a rectangular. base 13.-

As clearly indicated in Figs. 1, 2, 3 and 7 of the drawings, the upright end walls 11 are built up of a plurality of panels or plates including the upright end plates 14 of the base 13 and these upright end walls'll form the upright end walls of the material reducing chamber 15 of the apparatus. jected to wear by material being reduced they are provided with replaceable liner or wear plates 16.

A material reducingrotor 17 provided with hammers 18 extends across the bottom of material reducing chamber 15 and it rotates upon the axis of its central shaft 19 which extends transversely between, and at right angles to, the end walls 11. The ends of shaft 19 extend through the end walls 11 and are carried for rotation in suitable Where the wallsll would be subbearings 20 mounted on shelves made integral with the a base 13. One end of shaft 19 carries a flywheel 21 (Fig. 3) and the other end of said shaft 19 may be driven by any well-known means from any suitable source of power, not shown, to drive the rotor 17 in the direction of the arrow seen in Fig. 2 of the drawings- It may be mentioned that centrifugal force causes the hammers 18 to be maintained in their laterally. outermost or crushing positions during the operation of the apparatus and that the hammersvmay swing radially inwardly when they'strike materialbeing reduced or non-crushable mate: rials, such, for example, as tramp iron contained in the material. A

The top of the main frame, casing or housing 10 is provided with a feed opening 22 through which material may be fed into the reducing chamber 15. Reduced material passes from the apparatus through the open bottom of the base 13. V

An upright plate 23 at one side of the feed opening 22 extends transversely between the endwalls 11 and forms one side wall of the reducing chamber 15.. Plate 23 also functions as a chute for directing material fed into the reducingchamber 15 through the feed opening 22 toward the opposite side of the reducing chamber 15.

As seen in Fig. 2 of the drawings, the said opposite or left-hand side of the reducing chamber 15 is formed by an assembly 24 including a travelingbreaker plate 25 and a screen'26 contained wholly within the mainframe, casing or housing 10 and a breaker plate scraper assembly 27 adjacent the feed opening 22. The breaker plate; 7

and screen assembly 24 extends transversely between the end walls 11 of the main frame, casing or housing 10 and is adjustable as a unit with respect to the rotor 17. The traveling breaker plate 25 of the assembly 24 is actually an endless chain conveyer formed of solid block links pivotally connected together and looped about a frame and a head or drive shaft 28 and driven by the latter to travel in the direction of the arrow seen in Fig. 2 of the drawings. Head shaft 28 extends through one of the end walls 11 of main frame, casing or housing 10 and is driven by an electric motor 29 through sprocketsand a chain 30. The bar screen 26 of the assembly 24 is supported in cantilever and extends forwardly from the bottom of the traveling breaker plate 25 toward and under the rotor 17 and its free end is positioned substantially directly below the axis of said rotor as shown in Fig. 2 .of the drawings.

The traveling breaker plate and screen assembly 24 integral by welding to provide a relatively. tall, thin, openbacked rectangular box-like portion 32 that forms a rigid backing, bed or support for the endless traveling chain breaker plate and from which portion 32 a pair of spaced parallel screen bar supportingarmsl33 extend.

movableliner orrwearing plates 51 that overlap theends l Arms 33 are mounted in cantilever, one on each upright rections from adjacentthe tops of the end walls 34 of the.

frame portion 32. The top wall 37 of frame portion 32 carries an elongated bearing 38 ,through which the head or drive shaft 28 extends and said drive ,shaft is provided with a pair of sprockets spaced one at each end ofthe bearing 38, that carry and drive the endlesschain breaker plate 25.. The front wall 39 of said upright frame portion 32 is covered by a replaceable backing. bed or support plate 40 over which the upwardly traveling or working runof the endless chain breaker plate 25 travels and upon which it bears, The bottom wall of said uprightframe portion 32 carriesa plurality of aligned semicylindrical guide shoes 41 which extend across the bottom of said portion 32to guide the endless chain breaker plate 25 over the bottom of saidreplaceable backing, bed or support plate 40, and the rigid backing, bed or support portion 32 of,v the frame .31 where said breaker plate 25 passes between them and the screen 26 and begins or enters its upwardly, traveling working run across the side of the reducing chamber. 15..

The screen26lof the traveling breaker plate and screen assembly 24 includes a plurality of parallel screen bars which extend transversely between the arms 33 at right angles thereto. and are supported at their ends by the arms 33.,,, The screen bars mentioned include a pair of heavyside clamping bars 42 and 43 between which there are three screen bars 44. a Screen bars 44 are spaced apart by spacer blocks 45 positioned between the opposite end portions of bars 44, and the opposite ends of said screen bars 42 and 44 as well as the ends of the spacer blocks 45 are received in aligned arcuate channels or grooves 46, one of which is formed in eachof the spaced arms 33. All of the screen bars 42 and 44 and thespacer blocks 45 are clamped together and to the heavyside clamping bar 43 of the screen by a pair of arcuate; clamping rods or bolts 47 located one at each end of thescreen. Rods or bolts 47 extend. through aligned openings in the ends of the screen bars 44 and spacer blocks 45 and one end of eachof the rods or bolts 47 is securedinthe heavy side clamping bar 42. The oppositeend of each: rod or bolt 47 is received in a notch formed in theheavy side clamping bar 43 and is provided, with ainut ,which is tightened against the clamping bar 43 to cause the rods or bolts 47 and the clamping bars 42 and 43*.to clamp the screen elements 44 and 45 tightlytogethen.

Each end of the heavy side bar 43 is made to include an integral rectangular mounting block 48 that seats and is bolted into a groove or channel49 formed in one of the arms 33(see Fig. 5). The. groove or channel 49 extends radially vertically across the arcuate groove or channel 46 t and because the grooves or channels 46 and 49 intersect eachother nearly at right angles and because the screen bars are rigidly interlocked there will be no'movement of any of the screen bars along the said grooves or channels 46 and 49 in arms 33. i

The'cnds of the screen bars 42 and 44 are furthersupported attheir bottoms by anarcuatejblock 5 0 weldedto eacharrn and the sides of the ,armsBBnadjacentand facing screen bars, ,42 ,and 44, are protected by re-- of said bars.

The entire traveling breaker plate and screen assembly 24 is hung or suspended from adjacent its top between the spaced end walls 11 of the main frame, casing or housing 10 by the stub shafts 36 which extend through the end walls 11 and are carried in bearing blocks 52 welded to the latter. The axis of stub shafts 36 extends transversely of, and at right, angles to, the end walls 11 and the position of thelentireltraveling breaker plate and screen assembly 24 may be adjusted parallel to the axis of stub shafts 36 between the walls 11 by screws 53 which abut the bearing blocks 52 and are carried by ears or lugs 54 on the stub shafts 36. The position of the entire breaker plate and screen-assembly 24 is adjusted about the axis of stub shafts 36 with respect to the rotor 17 through a pair of axially aligned rods or bars 55 removably attached to the bottom of its upright frame portion 32 which extend through arcuate slots in the opposite end walls 11 and are adjustably connected to said end walls 11 by threaded adjusting rods 56 carried in cars 57 on said walls.

As clearly indicated in Figs. 2, 3 and 7 of the drawings the box-like portion 32 of the main frame or support 31 of breaker plate and screen assembly 24, as well as the travelingbreaker plate,25 thereof, extends transversely between the liner or wear plates 16 and the opposite end walls 11. The arms 33 of screen 26 are spaced laterally of the end walls 34 of frame31 by the spacer blocks 35, as illustrated most clearly in Figs. 3 and 4 of the drawings, in order that the arms 33 and the liner or wearing plates 51 which they carry will light directly below the lowermost liner plate 16 and extend adjacent and parallel to the end Walls 11 of the main frame, casing or housing 10. As clearly shown in .Figs. 2 and 7 of the drawings, the liner plates 16 above, and adjacent the end disks 58 of rotor 17 are sloped as at 59 to overlap said end disks 58 thereby to prevent, material falling in the material reducing chamber 15 fromentering between the end disks 58 and the walls 11 andto direct the material into the path of the hammers 18.; The arms 33 and liner plates 51 thereon are spaced, aparta distance greater than the distance measured axially along the rotor 17 and between the outside end surfaces of end disks 58 and they extend between the end disks 58 .and the end walls 11 of the main frame casing or housing 10 thereby to permit the breaker plate and screen assembly to be adjusted about the axis of stub shafts 36 toward .the rotor progressively as the diameter of. the p ath of travel of the hammers is reduced due to wear.

The traveling breakerplate. and screen assembly 24 maybe removedfromlthe main frame or housing 10 as a unitupon the withdrawal. of the adjusting rods or bars 55ifrom the frame 31 and the removal of a section or panel 60 from each end wall 11 of the main frame or housing 10.

When the crushing, grinding or pulverizing apparatus is in operation, the rotor 17 and the endless chain breaker plate 25, of course, are being driven in the directions indicated by the arrowsin Fig. 2 of the drawing. When the endless, chain breaker-plate. 25 is being so driven it travels or circulatesaround the head shaft 28 and upright, box-like portion 32 of the breaker plate and screen frame 31 and follows a pathindicatedin part by a broken line in Fig-2 of thedrawings. This path is from the sprockets on drive shaft 28 downwardly behind the-frame portion 32, over the guide shoes 41, through the space between the heavy screen bar 42 and the front of plate 40 on frame portion 32 and upwardly across said plate and one side of reducing chamber 15, under the scraper as r reducing surface formed by the working run of endless chain breaker plate 25 to be further reduced upon'impact therewith, and some of the material may be crushed between said breaker plate 25 and the hammers 18 by repeated pounding of the latter upon the material as it is fed by the hammers between the breaker plate 25 and rotor 17 toward the screen 26. The fully reduced material will passover or through the screen 26 tobe discharged from the apparatus.

Material that sticks to and is carried upwardly on the working surface of the traveling breakerplate 25 will, of course, be scraped therefrom and caused to fall downwardly into the path of the hammers 18 by the flexible r scraper blade of the scraper assembly 27. y

In Fig. 8 of the drawings there is shown a modified form of traveling breaker plate frame and screen 131 which may be substituted for the frame 31 in the crushing, grinding or pulverizingapparatus seen in Figs. 1, 2 and 3 of the drawings. Frame 131 includes an upright portion 132 and stub shafts 136 which are identical to the upright portion and stub shafts 31 andt36, respectively, of frame 31 and which, therefore, require no further description. The traveling breaker plate and frame 131 differs from the frame 31 substantially only in that it includes a screen 136 which is a casting including integral side frame arms 133 that are slotted at 61 to interfit with blocks 135 which are the equivalent of blocks 35 welded to the end walls 34. Arms 133 of screen 126 are bolted to the upright portion 132 of the frame 131 through the blocks 135. v

From the foregoing description it will be seen that by this invention there is provided a crushing, grinding or pulverizing apparatus of improved and simplified construction wherein there is a material reducing chamber including oppositely spaced walls positioned one at each end of a material reducing rotor and between which walls there extends, transversely and at one side of the rotor, an endless traveling chain breaker plate and screen assembly adapted to cooperate with the rotor to reduce material, and which assembly is adjustable with respect to the rotor to adjust the apparatus to grind the same or different materials to different degrees of fineness and/or to permit adjustment to compensate for wear of the reducing elements of the apparatus.

It will also be seen that the endless traveling chain breaker plate and screen assembly or unit includes frame means which is common to both the traveling breaker plate and the screen means thereof and that this frame means provides a bed portion about which the traveling endless chain breaker plate circulates or travels and that adjacent its bottom the frame also supports in cantilever the screen in such manner that the screen is spaced from the bed portion to provide a space between the bed portion and screen through which the traveling endless chain breaker plate may pass and whereby the screen extends from said bed portion under the rotor to cooperate with it in reducing material.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, and applicant therefore wishes not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of the invention, what it is desired to secure by Letters Patent of the United States is:

l. A crusher having a material reducing chamber, a material reducing rotor supported in the chamber for rotation about an axis extending transversely of the reducing chamber, a traveling breaker plate adjacent the rotor adapted to cooperate with the rotor in reducing material, a carrier and backing member for the traveling breaker plate disposed transversely in the reducing chamber parallel to the axis of rotation of the rotor, means swingably supporting the carrier and backing member in upwardly traveling orj the chamber for adjustment of the spacing of the breaker plate relatively to the rotor, said carrier and backing mem ber including means supporting a screen adjacent and beneath the rotor, said screen extending downwardly and away from the breaker plate adjacent the circumference of the rotor, said screen being spaced from the carrier and backing member permitting the breaker plate to travel between the carrier and backing member and the screen with the screen forming a continuation of the breaker plate, means for adjusting the carrier and backing mem ber to vary the dispositionof the breaker plate relatively to the rotor while. maintaining the breaker plate and the 7} screen in fixed position relatively to each other.

2. A crusher havingamaterial reducing chamber, a material reducingrotor supported in the chamber for rotation about an axis extending transversely of the reducing chamber, a traveling breaker plate adjacent the rotor adapted to cooperate with the rotor in reducing material,'a carrier and backing member for the traveling breaker plate disposed transversely in the reducing chamber parallel to the axis of rotation of the rotor, said carrier and backing member including means supporting a screen adjacent and beneath the rotor, said screen extending downwardly and away from the breaker plate adjacent the circumference 'of the rotor, said screen being spaced from the carrier and backing member permitting the breaker plate to travel between the carrier and backing member and the screen with the screen forming a continuation of the breaker plate, means for adjusting the carrier and backing member to vary the disposition of the breaker plate relatively to the rotor while maintaining the breaker plate and the screen in fixed position relatively to each other.

3. A crusher having a material reducing chamber, a material reducing rotor supported in the chamber for rotation about an axis extending transversely of the reducing chamber, a traveling breaker plate adjacent the rotor adapted to cooperate with the rotor in reducing material, a carrier and backing member for the traveling breaker plate disposed transversely in the reducing chamber parallel to the axis of rotation of the rotor, said carrier and backing member including means supporting a screen adjacent and beneath the rotor, said screen extending downwardly and away from the breaker plate adjacent the circumference of the rotor with the screen forming a continuation of the breaker plate, means for adjusting the carrier and backing member to vary. the disposition of the breaker plate relatively to the rotor While maintaining the breaker plate and the screen in fixed position relatively to each other.

4. A crusher having a material reducing chamber, a material reducing rotor supported in the chamber for rotation about an axis extending transversely of the reducing chamber, a traveling breaker plate adjacent the rotor adapted to cooperate with the rotor in reducing material and operating in a direction opposite to that of the rotor, a carrier and backing member for the traveling breaker plate disposed transversely in the reducing chamber parallel to the axis of rotation of the rotor, said carrier and backing member including means supporting a screen adjacent and beneath the rotor, said screen extending downwardly and away from the breaker plate adjacent the circumference of the rotor with the screen forming a continuation of the breaker plate, means for adjusting the carrier and backing member to vary the disposition of the breaker plate relatively to the rotor While maintaining the breaker plate and the screen in fixed position relatively to each other.

5. A crusher having a material reducing chamber, a material reducing rotor supported in the chamber for rotation about an axis extending transversely of the reducing chamber, a traveling breaker plate adjacent the rotor adapted to cooperate with the rotor in reducing material, a carrier and backing member for the traveling breaker plate disposed transversely in the reducing chamher parallel to the axis of rotation of the rotor, said traveling breaker plateoperating over the surface of the carrier and backing member in a direction opposite to the direction of rotation of the rotor, means swingably supporting the carrier and backing member in the chamber for adjustment of the spacing of the breaker plate relatively to the rotor, said carrier and backing member including means supporting a screen adjacent and beneath the rotor, said screen extending downwardly and away from the breaker plate adjacent the circumference of the rotor, saidscreen being spaced frornthe carrier and backing member permitting the breaker plate to travel between the carrier and backing member and the screen, with the screen forming a continuation of the breaker plate, means for adjusting the carrier and backing member to vary, the disposition of the breaker plate relatively to the rotor while maintaining the breaker plate and the screen in fixed position relatively to each,

other. I

References Cited in the file of this patent V UNITED STATES PATENTS 1,494,302 Borton May 13, 1924 v1,696,213 Shelton Dec. 25, 1928 2,381,661 Fowler Aug. 7, 1945 2,464,774 Keiper Mar. 15, 1949 2,471,068 Keiper -1 May 24, 1949 2,523,004 Fowler Sept. 19, 1950 2,666,589 Danyluke Jan. 19, 1954 FOREIGN PATENTS 420,162 Great Britain Nov. 26, 1934 

